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How to find the size of an array in postgresql
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112
As vyegorov mentioned, array_length will do the trick. Or if you know that the array is 1-dimen...
SQL query for today's date minus two months
... select all the records in a table where their date of entry is older then 2 months.
5 Answers
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Turn Pandas Multi-Index into column
I have a dataframe with 2 index levels:
3 Answers
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List All Redis Databases
...mand to know the number of databases:
CONFIG GET databases
1) "databases"
2) "16"
You can use the following command to list the databases for which some keys are defined:
INFO keyspace
# Keyspace
db0:keys=10,expires=0
db1:keys=1,expires=0
db3:keys=1,expires=0
Please note that you are supposed ...
Mercurial move changes to a new branch
...e rebase extension. Suppose you have a history like this:
@ changeset: 2:81b92083cb1d
| tag: tip
| summary: my new feature: edit file a
|
o changeset: 1:8bdc4508ac7b
| summary: my new feature: add file b
|
o changeset: 0:d554afd54164
summary: initial
This means,...
Django “login() takes exactly 1 argument (2 given)” error
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236
Your view function is also called login, and the call to login(request, user) ends up being in...
How to set a Timer in Java?
How to set a Timer, say for 2 minutes, to try to connect to a Database then throw exception if there is any issue in connection?
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Generate a random double in a range
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241
To generate a random value between rangeMin and rangeMax:
Random r = new Random();
double ran...
List of encodings that Node.js supports
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2 Answers
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John Carmack's Unusual Fast Inverse Square Root (Quake III)
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answered Aug 28 '09 at 21:52
RushyoRushyo
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